21312110021051 has 2 divisors, whose sum is σ = 21312110021052. Its totient is φ = 21312110021050.

The previous prime is 21312110021047. The next prime is 21312110021063. The reversal of 21312110021051 is 15012001121312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21312110021051 - 2² = 21312110021047 is a prime.

It is a super-3 number, since 3×21312110021051³ (a number of 41 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (21312110021011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656055010525 + 10656055010526.

It is an arithmetic number, because the mean of its divisors is an integer number (10656055010526).

Almost surely, 2^{21312110021051} is an apocalyptic number.

21312110021051 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312110021051 is an equidigital number, since it uses as much as digits as its factorization.

21312110021051 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 120, while the sum is 20.

Adding to 21312110021051 its reverse (15012001121312), we get a palindrome (36324111142363).

The spelling of 21312110021051 in words is "twenty-one trillion, three hundred twelve billion, one hundred ten million, twenty-one thousand, fifty-one".